Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f656f91bd19d12…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 23:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b32b8a387b1edc92b034768d92ca04a1 SHA-1: ad5b6c3eabee9fb16461b3aa4e3944b86d283639 SHA-256: a3f656f91bd19d12c0ed9b18bd8f7af73ae4573f7f1ec5ee0db2dacc0c38d5a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://laclonghotel.vn/upload/files/28073654157.pdf In PDF document text
    • http://agro-vostok.ru/userfiles/file/sawebelesumefakob.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pevezofasobat.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/8049577957.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3afd23b0973ee019864ca3d7034c1ef8/53069461348.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae3805014---ponisuxepetuzikaxu.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/getiwite.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/vevabuzadojarikamoraxupu.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/nawilagejozomidedazufena.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/61334413736.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/lakedibezaduliz.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/71205498866.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/56525399376.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63b0b39c8---24434483137.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/11554c8757885256890f7aff0f933726/musavuvagukekoz.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/bokukisapigojopila.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/68250691907.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/ritezifikuluredugosowe.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/zasadiwozusanozuwe.pdfIn PDF document text
    • https://nexusmediation.nl/files/nuxas.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88439100718.pdfIn PDF document text
    • https://servauto.fr/img/user/file/seledazumiwilot.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/najudivejujafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rimworld+free+steam+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 10748 bytes
SHA-256: a825b863ec527d2a0d3eec4d87e6010c9b0c56300a7f5581493aa0e23f1c103f
font_01_sfnt_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 16200 bytes
SHA-256: cd05ed31f88d3ec275c94eee955b40dd2643d7eba78fc99a21537c2ea2b4313b
font_02_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.